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Emergency networks, especially networks of disaster recovery, have been the focus of active research in many countries. That is due to the broad impact of disasters' frequent occurrences, and casualties. The Hybrid Network Emergency Communication (HNEC) protocol is proposed [9] which establishes a heterogeneous network disaster recovery (NDR) that includes non-IP systems to achieve emergency requirements...
Life time and Energy Efficiency are important factors in the design of wireless sensor network. A critical issue during data collection is the formation of energy holes near the sink. Sensors near the sink have to participate in relaying data on behalf of other sensors and thus their energy will be depleted very quickly. The mobile sink movement yields the significant performance gained through decreasing...
This paper presents a new deployment formulation in order to improve coverage in Sensor Networks. Sensor deployment is an important issue in designing sensor networks. This paper studies the geometric properties of voronoi diagram, addressing a divide-and-conquers deployment protocol in an area of interest. This novel methodology can deploy homogeneous sensor while heterogeneous sensor in whole area...
Barrier coverage that requires much fewer sensors than full coverage, is known to be an appreciate model for detection applications. Early results have shown how to construct barriers by both randomly and planned deployment in belt regions. In randomly deployment condition, there may be more than one barrier in a belt region. We present a solution for sliding barriers among the sensors that are deployed...
One of the challenges of the wireless sensor networks is problem of having coverage while keeping connectivity. In this paper we have proposed a method in which we can cover a set of discrete targets in a field considering the k-angle coverage. In k-angled coverage, it is guaranteed that any target in the area should at least be covered by k sensor in a way that the peripheral area of such targets...
In WSN, sensors near the sink have to relay the data of the nodes away from the sink and as a result they drain their energy very quickly. It result in network partitioning and can significantly limit the network lifetime. This problem is termed as hotspot problem. Recently, formation of hot spot or energy hole near the sink has emerged as a critical issue for data gathering in WSN. In this paper,...
Sensors are now attached to a lot of mobile objects such as animals and vehicles to collect data. This forms intermittently connected mobile sensor network due to weak communication power and nodal mobility, in which conventional routing protocols in wireless sensor network don't work. In this paper, we propose a data harvesting scheme for intermittently connected mobile sensor network. This approach...
Sensor web which is called new trend of nowadays, the development of wireless network environment and minimization of sensor make practical monitoring on physical environment possible. Sensor is being a clear technical trend which autonomously senses increase of usefulness on access of wireless and mobile network, and distributed network. Therefore, Web-service which is about sensor network including...
This paper presents a distributed fermat-point range estimation strategy, which is important in the moving sensor localization applications. The fermat-point is defined as a point which minimizes the sum of distances from three sensors inside a triangle. This point is indeed at the trianglepsilas center of gravity. We solve the problems of large errors and poor performance in the bounding box algorithm...
Sink mobility has become an increasingly important requirement of various sensor network applications. Handling such mobile sink conditions brings new challenges to large-scale sensor networking. This investigation proposed a hybrid-structure routing protocol (HSRP) that combines the benefits of grid-based and cluster-based structures. Grid-based structure is designed to solve the cluster head selection...
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